Radio frequency

Radio frequency

Radio frequency (RF) is a frequency or rate of oscillation within the range of about 3 Hz to 300 GHz. This range corresponds to frequency of alternating current electrical signals used to produce and detect radio waves. Since most of this range is beyond the vibration rate that most mechanical systems can respond to, RF usually refers to oscillations in electrical circuits or electromagnetic radiation.

Special properties of RF electrical signals

Electrical currents that oscillate at RF have special properties not shared by direct current signals. One such property is the ease with which it can ionize air to create a conductive path through air. This property is exploited by 'high frequency' units used in electric arc welding. Another special property is an electromagnetic force that drives the RF current to the surface of conductors, known as the skin effect. Another property is the ability to appear to flow through paths that contain insulating material, like the dielectric insulator of a capacitor. The degree of effect of these properties depends on the frequency of the signals.

Frequencies

ee also

* Radio waves
* Frequency allocation
* Plastic Sealing/Welding Technologies
* Ultrasound
* RF connector

External links

* [http://www.vlf.it/frequency/bands.html Definition of frequency bands (VLF, ELF … etc.) IK1QFK Home Page (vlf.it)]
* [http://www.sengpielaudio.com/calculator-wavelength.htm Radio, light, and sound waves, conversion between wavelength and frequency]
* [http://www.rfzone.org/free-rf-ebooks/ RF eBooks - Some free RF related eBooks]
* [http://www.myrf.org RF and Telecommunication eBooks]
* [http://www.sunmantechnology.com/resources_gls_rfts.html RF Terms Glossary]


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